The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A296613 Smallest k such that either k >= n and k is a power of 2, or k >= 5n/3 and the prime divisors of k are precisely 2 and 5. 1
 1, 2, 4, 4, 8, 8, 8, 8, 16, 16, 16, 16, 16, 16, 16, 16, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 128, 128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS First disagreement with A062383(n-1) is at n = 129. For n > 2, a(n) is not squarefree. - Iain Fox, Dec 17 2017 LINKS Eric M. Schmidt, Table of n, a(n) for n = 1..10000 Bernadette Faye, Florian Luca, Pieter Moree, On the discriminator of Lucas sequences, arXiv:1708.03563 [math.NT], 2017, Theorem 1. PROG (PARI) a(n) = for(k=n, +oo, if(k == 2^valuation(k, 2) || (k >= 5*n/3 && factor(k)[, 1] == [2, 5]~), return(k))) \\ Iain Fox, Dec 17 2017 CROSSREFS Cf. A033846. Sequence in context: A265544 A290221 A098820 * A062383 A034583 A076347 Adjacent sequences:  A296610 A296611 A296612 * A296614 A296615 A296616 KEYWORD nonn AUTHOR Eric M. Schmidt, Dec 16 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 13 19:30 EDT 2020. Contains 336451 sequences. (Running on oeis4.)